Rehype is a powerful HTML processor built on the unified framework. It allows you to parse, transform, and stringify HTML content. It is highly extensible and can be used for a variety of tasks such as sanitizing HTML, extracting content, and transforming HTML structures.
Parsing HTML
Rehype can parse HTML strings into a syntax tree, which can then be manipulated or analyzed.
const rehype = require('rehype');
const html = '<h1>Hello, world!</h1>';
rehype().parse(html);Transforming HTML
Rehype allows you to transform HTML content by manipulating the syntax tree. You can use plugins or custom functions to modify the tree.
const rehype = require('rehype');
const html = '<h1>Hello, world!</h1>';
rehype()
.use(() => (tree) => {
// Transform the tree
})
.process(html)
.then((file) => {
console.log(String(file));
});Stringifying HTML
Rehype can convert a syntax tree back into an HTML string, allowing you to output the transformed content.
const rehype = require('rehype');
const tree = { type: 'root', children: [{ type: 'element', tagName: 'h1', properties: {}, children: [{ type: 'text', value: 'Hello, world!' }] }] };
rehype().stringify(tree);Sanitizing HTML
Rehype can be used to sanitize HTML content, removing potentially dangerous elements and attributes.
const rehype = require('rehype');
const rehypeSanitize = require('rehype-sanitize');
const html = '<script>alert("Hello, world!")</script><p>Safe content</p>';
rehype()
.use(rehypeSanitize)
.process(html)
.then((file) => {
console.log(String(file));
});Htmlparser2 is a fast and forgiving HTML/XML parser. It is similar to rehype in that it can parse HTML into a tree structure, but it is more focused on speed and less on extensibility and transformations.
Jsdom is a JavaScript implementation of the DOM and HTML standards. It allows you to manipulate HTML content in a way similar to how you would in a browser. Unlike rehype, jsdom provides a full DOM API, making it more suitable for complex manipulations and simulations of browser environments.
Cheerio is a fast, flexible, and lean implementation of core jQuery designed specifically for the server. It allows you to parse and manipulate HTML using a jQuery-like syntax. While rehype focuses on transformations and extensibility, cheerio is more about providing a familiar API for DOM manipulation.
The rehype processor is a HTML processor powered by plug-ins.
Don’t need the parser? Or the compiler? That’s OK.
npm:
npm install rehype
var rehype = require('rehype');
var report = require('vfile-reporter');
rehype().process('<title>Hi</title><h2>Hello world!', function (err, file) {
console.log(report(err || file));
console.log(String(file));
});
Yields:
no issues found
<html><head><title>Hi</title></head><body><h2>Hello world!</h2></body></html>
Configuration for rehype-parse and rehype-stringify can be given as an object between the document and the callback.
FAQs
HTML processor powered by plugins part of the unified collective
The npm package rehype receives a total of 405,319 weekly downloads. As such, rehype popularity was classified as popular.
We found that rehype demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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